Spatial Engine PostGIS

A spatial engine provides access to a service that can perform spatial operations, one of the available spatial engines is for PostGIS.

Namespace

urn:com.cohga.server.spatial.geotools#1.0

Tags

spatialengine

Properties

Name	Type	Required	Description
id	string	yes	Unique identifier
dbtype	'postgis'	yes	The name of the driver to use, in this case PostGIS
host	string	yes	The hostname or ip address of the server
port	number	yes	The port number that the instance is running on
database	string	yes	The database to connected to
schema	string	no	The default schema to connected to, default is 'public'
user	string	no	The userid used when connecting to the database
passwd	string	no	The password used when connecting to the database
minconnections	integer	no	The minimum number of connections to open to the database
maxconnections	integer	no	The maximum number of connections to open to the database
validateconnections	boolean	no	Should database connections be checked on each access to see if they're still valid
namespace	string	no	The namespace prefix
loosebox	boolean	no	If set to 'true' if the Bounding Box should be 'loose', faster but not as deadly accurate
estimatedextent	boolean	no	set to true if the bounds for a table should be computed using the 'estimated_extent' function, but beware that this function is less accurate, and in some cases * far* less accurate if the data within the actual bounds does not follow a uniform distribution. It also relies on the fact that you have accurate table stats available. So it is a good idea to 'VACUUM ANALYZE' the postgis table

Sub-tags

None

Content

None

Examples

Basic PostGIS connection

<spatial:spatialengine id="postgis">
	<dbtype>postgis</dbtype>
	<host>mysqlhost</host>
	<port>5432</port>
	<database>spatial</database>
	<user>gis</user>
	<passwd>hak0rz</passwd>
</spatial:spatialengine>

Primary Key Table

For specifying primary key columns when Weave/GeoTools can not determine it directly.

SQL create statement for gt_pk_metadata table

CREATE TABLE gt_pk_metadata (
 table_schema VARCHAR(32),
 table_name VARCHAR(32) NOT NULL,
 pk_column VARCHAR(32) NOT NULL,
 pk_column_idx INTEGER,
 pk_policy VARCHAR(32),
 pk_sequence VARCHAR(64),
 unique (table_schema, table_name, pk_column),
 check (pk_policy in ('sequence', 'assigned', 'autogenerated'))
)

Column	Description
table_schema	Name of the database schema in which the table is located.
table_name	Name of the table to be published
pk_column	Name of a column used to form the feature IDs
pk_column_idx	Index of the column in a multi-column key. In case multi column keys are needed multiple records with the same table schema and table name will be used.
pk_policy	The new value generation policy, used in case a new feature needs to be added in the table ('assigned', 'sequence' or 'autogenerated'). Where: 'sequence' means that the value for the column is generated using a database sequence, and the 'pk_sequence' value must be set. 'autogenerated' means that the value for the column is generated by the database using another method. 'assigned' means that the value for the column is determined by the current maximum value +1, if the column is an integral type, or as a random string if the column is textual.
pk_sequence	The name of the database sequence to be used when generating a new value for the pk_column. The pk_sequence value only need to be set if the pk_policy is 'sequence'.

Using primary key metadata configuration

You can also specify the above information directly in the spatial engine configuration.

Name	Description
name	The table name
schema	The optional table schema
column	The column in the the table that contains the unique id
policy	How the key is generated
sequence	The name of the database sequence to use if the policy is 'sequence'

Using primary key metadata

<spatial:spatialengine id="postgis">
  <dbtype>postgis</dbtype>
  <host>mysqlhost</host>
  <port>5432</port>
  <database>spatial</database>
  <user>gis</user>
  <passwd>hak0rz</passwd>
  <primarykeymetadata>
    <table name="park" column="gid" policy="autogenerated"/>
    <table name="property" column="park_id" type="autogenerated"/>
    <table name="road" column="objectid" type="autogenerated"/>
  </primarykeymetadata>
</spatial:spatialengine>

Using geometry metadata configuration

As of Weave 2.5.16 it's possible to specify the information contained in the geometry metadata table directly in the spatial engine configuration.

Name	Description
name	The table name
schema	The optional table schema
type	The geometry type (point, linestring, polygon, multipoint, multilinestring, multipolygon)
srid	The geometry srid
dimension	The geometry dimension

Using geometry metadata table

<spatial:spatialengine id="postgis">
  <dbtype>postgis</dbtype>
  <host>mysqlhost</host>
  <port>5432</port>
  <database>spatial</database>
  <user>gis</user>
  <passwd>hak0rz</passwd>
  <geometrymetadata>
    <table schema="public" name="park" type="multipolygon" srid="28355" dimension="2"/>
    <table schema="public" name="property" type="polygon" srid="28355" dimension="2"/>
    <table schema="public" name="road" type="linestring" srid="28355" dimension="2"/>
  </geometrymetadata>
</spatial:spatialengine>